Electromagnetic Induction & Alternating Currents (NEET Physics): Questions 77 - 80 of 121

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Question number: 77

» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction

MCQ▾

Question

The angular disc of copper, with inner radius a and outer radius b is rotating with a uniform angular speed ω, in a region where a uniform magnetic field B along the axis of rotation exists. Then, the emf induced between inner side and the outer rim of the disc is-

Angular disc of copper in magnetic field

Angular Disc of Copper in Magnetic Field

The angular disc of copper, with inner radius a and outer radius b is placed in a uniform magnetic field B.

Choices

Choice (4) Response

a.

12Bωa2

b.

12Bωb2

c.

Zero

d.

12Bω(b2a2)

Question number: 78

» Electromagnetic Induction & Alternating Currents » Reactance and Impedance

MCQ▾

Question

In an inductor of inductance L = 100 mH, a current of I = 10A is flowing. The energy stored in the inductor is

Choices

Choice (4) Response

a.

100 J

b.

10 J

c.

1000 J

d.

5 J

Question number: 79

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

Voltage (r. m. s) in the secondary coil of a transformer depends upon

(1) Voltage in the primary coil

(2) Ratio of number of turns in the two coils

(3) Frequency of the source

(4) Time-period of the source

Select the correct answers and mark it according to the following

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

Question number: 80

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

Two inductors L 1 and L 2 are at a sufficient distance apart. Equivalent inductance when they are connected (i) in series (ii) in parallel are

Choices

Choice (4) Response

a.

L1L2,L1L2L1L2

b.

None

c.

L1+L2,L1L2L1+L2

d.

L1L2,L1+L2L1L2

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